Evolution of faint galaxy clustering. The 2-point angular correlation function of 20,000 galaxies to V<23.5 and I<22.5
Abstract
The UH8K wide field camera of the CFHT was used to image 0.68 deg2 of sky. From these images, ~ 20,000 galaxies were detected to completeness magnitudes V<23.5 and I<22.5. The angular correlation function of these galaxies is well represented by the parameterization omega (theta ) = A_W theta -delta . The slope delta =~ -0.8 shows no significant variation over the range of magnitude. The amplitude A_W decreases with increasing magnitude in a way that is most compatible with a Lambda CDM model (Omega_0 = 0.2, Lambda =0.8) with a hierarchical clustering evolution parameter epsilon >0. We infer a best-fit spatial correlation length of r00 =~ 5.85+/-0.5 h-1 Mpc at z=0. The peak redshift of the survey (I<=22.5) is estimated to be zpeak ~ 0.58, using the blue-evolving luminosity function from the CFRS and the flat Lambda cosmology, and r_0(zpeak) =~ 3.5+/-0.5 h-1 Mpc. We also detect a significant difference in clustering amplitude for the red and blue galaxies, quantitatively measured by correlation lengths of r00=5.3+/-0.5 h-1 Mpc and r00=1.9+/-0.9 h-1 Mpc respectively, at z=0.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 2000
- DOI:
- 10.48550/arXiv.astro-ph/0007184
- arXiv:
- arXiv:astro-ph/0007184
- Bibcode:
- 2000A&A...364..349C
- Keywords:
-
- Cosmology: Large-Scale Structure of Universe;
- Galaxies: Evolution;
- Astrophysics
- E-Print:
- 21 pages, 21 figures,accepted in Astronomy and Astrophysics